<style>
    .app-loading {
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        background: linear-gradient(135deg, #667eea 0%, #764ba2 50%, #f093fb 100%);
        background-size: 200% 200%;
        animation: gradientShift 3s ease infinite;
        display: flex;
        flex-direction: column;
        justify-content: center;
        align-items: center;
        z-index: 9999;
        font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
        overflow: hidden;
    }

    .app-loading::before {
        content: '';
        position: absolute;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background: radial-gradient(circle at 20% 50%, rgba(255, 255, 255, 0.1) 0%, transparent 50%),
            radial-gradient(circle at 80% 20%, rgba(255, 255, 255, 0.1) 0%, transparent 50%),
            radial-gradient(circle at 40% 80%, rgba(255, 255, 255, 0.1) 0%, transparent 50%);
        animation: float 6s ease-in-out infinite;
    }

    .loading-container {
        position: relative;
        z-index: 1;
        text-align: center;
        animation: fadeInUp 0.8s ease-out;
    }

    .loading-spinner {
        width: 80px;
        height: 80px;
        position: relative;
        margin: 0 auto 30px;
    }

    .loading-spinner::before {
        content: '';
        position: absolute;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        border: 3px solid rgba(255, 255, 255, 0.2);
        border-radius: 50%;
        border-top: 3px solid #ffffff;
        animation: spin 1.2s cubic-bezier(0.68, -0.55, 0.265, 1.55) infinite;
        box-shadow: 0 0 20px rgba(255, 255, 255, 0.3);
    }

    .loading-spinner::after {
        content: '';
        position: absolute;
        top: 8px;
        left: 8px;
        width: calc(100% - 16px);
        height: calc(100% - 16px);
        border: 2px solid rgba(255, 255, 255, 0.1);
        border-radius: 50%;
        border-right: 2px solid rgba(255, 255, 255, 0.6);
        animation: spin 0.8s linear infinite reverse;
    }

    .loading-text {
        color: #ffffff;
        font-size: 28px;
        font-weight: 600;
        margin-bottom: 15px;
        opacity: 0.95;
        text-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
        letter-spacing: 1px;
        animation: pulse 2s ease-in-out infinite;
    }

    .loading-subtitle {
        color: rgba(255, 255, 255, 0.8);
        font-size: 16px;
        font-weight: 400;
        text-shadow: 0 1px 5px rgba(0, 0, 0, 0.2);
        letter-spacing: 0.5px;
    }

    .loading-dots {
        display: inline-block;
        animation: dots 1.8s infinite;
        font-weight: 500;
    }

    .loading-dots::after {
        content: '';
        animation: dots 1.8s infinite;
    }

    .loading-progress {
        width: 200px;
        height: 4px;
        background: rgba(255, 255, 255, 0.2);
        border-radius: 2px;
        margin-top: 25px;
        overflow: hidden;
        position: relative;
    }

    .loading-progress::before {
        content: '';
        position: absolute;
        top: 0;
        left: -100%;
        width: 100%;
        height: 100%;
        background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.8), transparent);
        animation: progress 2s ease-in-out infinite;
    }

    @keyframes gradientShift {
        0% {
            background-position: 0% 50%;
        }

        50% {
            background-position: 100% 50%;
        }

        100% {
            background-position: 0% 50%;
        }
    }

    @keyframes float {

        0%,
        100% {
            transform: translateY(0px) rotate(0deg);
        }

        50% {
            transform: translateY(-20px) rotate(180deg);
        }
    }

    @keyframes fadeInUp {
        0% {
            opacity: 0;
            transform: translateY(30px);
        }

        100% {
            opacity: 1;
            transform: translateY(0);
        }
    }

    @keyframes spin {
        0% {
            transform: rotate(0deg);
        }

        100% {
            transform: rotate(360deg);
        }
    }

    @keyframes pulse {

        0%,
        100% {
            opacity: 0.95;
            transform: scale(1);
        }

        50% {
            opacity: 1;
            transform: scale(1.05);
        }
    }

    @keyframes dots {

        0%,
        20% {
            content: '';
        }

        40% {
            content: '.';
        }

        60% {
            content: '..';
        }

        80%,
        100% {
            content: '...';
        }
    }

    @keyframes progress {
        0% {
            left: -100%;
        }

        100% {
            left: 100%;
        }
    }

    /* 淡出动画 */
    .app-loading.fade-out {
        opacity: 0;
        transform: scale(0.95);
        transition: all 0.6s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    }

    /* 响应式设计 */
    @media (max-width: 768px) {
        .loading-text {
            font-size: 24px;
        }

        .loading-subtitle {
            font-size: 14px;
        }

        .loading-spinner {
            width: 60px;
            height: 60px;
        }

        .loading-progress {
            width: 150px;
        }
    }

    @media (max-width: 480px) {
        .loading-text {
            font-size: 20px;
        }

        .loading-subtitle {
            font-size: 13px;
        }

        .loading-spinner {
            width: 50px;
            height: 50px;
        }

        .loading-progress {
            width: 120px;
        }
    }
</style>

<div class="app-loading" id="app-loading">
    <div class="loading-container">
        <div class="loading-spinner"></div>
        <div class="loading-text">Easy Admin</div>
        <div class="loading-subtitle">正在加载应用<span class="loading-dots"></span></div>
        <div class="loading-progress"></div>
    </div>
</div>